Solid uniform spherical boulder rolls down the hill

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A solid uniform spherical boulder rolls down the hill as shown in the figure(Figure 1) , starting from rest when it is H = 43.0{\rm m} above the bottom. The upper half of the hill is free of ice, so the boulder rolls without slipping. But the lower half is covered with perfectly smooth ice. Part A How fast is the boulder moving when it reaches the bottom of the hill? v = __________________m/s}

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